Device for supporting tubes in core box assemblies



Feb. 7, 1961 J. A. HALGREN ET AL 2,970,352

DEVICE FOR SUPPORTING TUBES IN CORE BOX ASSEMBLIES Filed Nov. 3, 1958 2 Sheets-sh 1 a a gw Q HQ INVENTOFS do l-IN ,4. Ala/. 1? EN E0 55/9714. P1 Me EL ALA-x fiL/Nov/Tz 1961 J. A. HALGREN ET AL 2,970,352

DEVICE FOR SUPPORTING TUBES IN CORE BOX ASSEMBLIES Filed Nov. 3, 1958 2 Sheets-Sheet 2 IN VENI'OIES JOHN A. HALGEEN fioas/eru uvxa ALEX I71.) NO v1 rz Af/ OFN E v DEVICE FOR SUPPORTING TUBES IN ASSEMBLIES United States Patent'O" and Alex Filinovitz, Chicago, Ill., assignors to International Harvester Company, Chicago, 111., a corporation of New Jersey 1 Filed Nov. a, 1958, set. No. 711,325

Claims. (Cl. 22-160) This invention relates to mold and core box assemblies. More specifically the invention relates to a separable core box having one or more supporting devices for supporting tubular members in position during the formation of cores or molds.

In the formation or blowing of cores it is frequently desirable to place different metallic objects, such as tubes, etc., in the core box in position so that the objects are firmly embedded within the finished core. Then when the core is placed into the mold box and the metal is poured the tubes become firmly secured within the finished mold product. Similarly it may' be desired to secure various objects within the mold proper, and thus in mold boxes it may be desirable to provide means whereby the objects to be formed with the mold are firmly supported in position. In the formation of cylinder heads it is, in certain instances, desirable to integrally mold into the head various tubular members which in turn, in the finished product, become cooling jets strategically located to cool various hot portions of the internal surfaces thereof. In order to provide tubes within the cylinder heads it is desirable to first properly support the tubes within a core box so that the finished core will have the tubes firmly embedded within said, core. Great difiiculties have been foundin the past in supporting the tubular members, and it is a prime object of this invention to provide an improved means or device for supporting tubular members or other objects within the core box or mold box in the formation of cores 'ormolds.

Still a further object is the provision of an improved tube supporting device which is readily assembled with a core box and which will support atube within the box during the formation of the core, the said supporting device being readily removable with the core .from the box so that the core retains its shape and the chances o damage to the core are greatly lessened. A further object is the provision of a core box assembly having a cavity with a bottom wall, the said wall and the tapered bore being such that the bore is sealed .during the blowing of cores but the device is readily removable after the formation of the core when it is desiredto remove the same. from the assembly. ,A still further object is theprovision of an improved core box assembly, one of thewalls of the cavity of the box having atleast onetapered opening adapted to receive a tapered plug .or supporting device which will mate with the bore and which will support an object to be positioned within the core box, the said device being of tapered plug shape so as to have a non-locking though Patented Feb. 7, 1961 2 sealing relation with'respect to the bore provided in the core box. I I

These and other objects will become more readily apparentfrom a reading of the description when examined in connection with the accompanying sheets of drawings.

In the drawings:

Figure 1 is a plan view of a core box section showing the interior cavity of said section;

Figure 2 is a partial side elevational view of a core box assembly showing two half portions or sections of the assembly;

Figure 3 is a bottom view of a finished sand core formed in the core box section and in the assembly shownin Figures 1 and 2 respectively;

Figure 4 is a side elevational view of a supporting de vice for supporting tubular members within a core or mold box;

Figure 5 is a plan view of the device shown in Figure 4;

Figure 6 is a fragmentary enlarged view of a portion of a core box section showing a tubular supporting device in position in a wall of the core box;

Figure 7 is a view similar to Figure 6 ,showing a supporting device in position, the said view also being fragmentary and showing a portion of a finished sand mold;

Figure 8 is a fragmentary view in cross section of a I portion of a core box in an inverted position, the view showing a portion of'a sand core and a supporting device immediately after the core has been removed from a core box; and

Figure 9 is an exploded detail view showing a portion of a completed core having a tubular projection, the said tubular projection being shown immediately after its removal from a supporting device or plug.

Referring now particularly to Figures 1 and 2 a core box is generally designated by the reference character '10. The core box 10 includes a pair of'separable sections 11 and 12 having transversely extending parting flanges or faces 13. While the present invention shows a core box assembly it is to be understood that it is equally applicable to the formation of molds since the same operating principles apply. Thus for the purposes of the present'disclosure the terms mold box and core box will be used interchangeably. The parting flanges 13 of the section 12 also includes a plurality of alignment pins 14 which as shown in Figure 2 may serve to suitably align the separable sections 11 and12.

The section 12 is also provided with a molding cavity 15 which includes a plurality of configurations and shapes 16 to produce the necessary cavities and projections in the core which is to be formed in the said cavity 15. The shapes and configuration 16 will not be described in detail since they are entirely dependent upon the particular core which is to be produced.

In the present disclosure the core which is to be reproduced is a cylinder head core which in additionto a mold will provide the necessary configurations and cavities'to form a cylinder head. In the particular cylinder head which is to be finally manufactured it is desirable to include therein a plurality of tubeswhich are to be strategically placed so that in the cooling operation of an internal combustion engine these tubes will act as jets to cool certain hot portions of the cylinder head or the cylinder block. So that these tubes can properly be cast with the cylinder head it is desired that they first be molded with the core tobecome a relatively integral part therewith. These tubes are designated at 17 andeach tube comprises a nozzle portion 18 and a support end 19.

The cavity 15 includes a bottom wall 20, and this wall 20 is provided with a plurality of bores 21- which extend through the said wall 20. Each bore 21 includes a a pering wall 22, the said wall 22, as shown in Figures 6 and 8 tapering from its widest end portion adjacent the cavity 20 to a relatively narrow portion formed at the outermost portion of the wall 20. A supporting member,' device, or plug for suitably supporting the tubes 17 is generally designated by the reference character 23. The device 23 comprises'a'ibore 24 opening outwardly onto a top surface 25, the said bore 24 extending downwardly into the plug 23 and being closed at its lowermost end. The supporting member 23 also comprises a bottom 26 which is joined by a tapering side wall 27.

Examining now Figures 6, 7 and 8 it can be seen that the supporting portions 19 of the tubes 17 are in supporting or mating relation within the bores 24 of the plugs 23. Inthe supporting position of the plugs 23 the .plugs are placed within the bores 21 as shown in Figures .6. and 7. In this position it is apparent that the tapering side wall 27 tapers downwardly and inwardly a greater extent than the taper of the bores 21. The tapering wall 22 thus at its bottom or outwardmost end has a greater diameter dimension than the bottom wall 26 of the plug 23. The uppermost portion of the plug 23 which is closest to the cavity is however sufliciently large in diameter to form a good seal between the upper end of the bore 21 and the interior of the cavity 20.

It is'desired now to form a mold or core 28. The core 28 to be formed is generally formed by means of a core blowing machine which inconventional fashion blows sand into the core box assembly. Similarly if a mold is to be formed it can also be formed by suitable mold blowers. Figure 3 shows a sand mold 28 which is formed in'the core box assembly 10. This mold in its finished condition includes suitable configurations and shapes generally "designated at 29, these of course being formed by the configurations and shapes 16 of the section 12. Since it is desired to embed the tubes 17 within the core'28' the tubes are placed with their end portions 19 within the plugs 23. The plugs 23 are then suitably inserted and they in turn have their upper ends wedged into the bores 21 to suitably seal the bores 21 from the cavity 20. The sand is then blown into the core and the core 28 is formed. The sections are then separated and the section 12 is inverted into the position shown in Figure 8 wherein the core is quickly and easily removed from the core box section 12. This is particularly the case since the plugs 23 are of non-locking tapering shape =andare easily removed from the bores and yet the bores 21 are suitably sealed during the blowing of the cores. After'the core'28 has'been removed from the core box it is'a simple matter to remove the plug 23 from the end of the tube 19 as shown in Figure 9.

By forming the plugs 23 of a non-locking taper, adequate and sufiicient support is provided for the tube 17 and yet the plugs 23 may be easily removed from the core box while definitely forming a good seal during the blowing of the cores. Previous attempts to support the tubes would usually involve providing a number of bores within the walls of a cavity. Then the tubes would be inserted in the bores but it was found that this arrangement was very unsatisfactory in that sand, during the "blowing operation, would become wedged between the tube ends and the straight bores whereupon the cores could not be removed from the assembly without breakage. This is avoided by the'utilization of the plugs having the non-tapering relation.

Thus it is apparent that an improved supporting member'for supporting tubes and the like, in core boxes has beendescribed. It mustbe understood that changes and -modificationsmaybe' made without departing from the spiritof the invention as disclosed or the scope thereof as defined in the appended claims;

1. In a mold box assembly including a pair of cornplemental sections having opposed parting faces providing "a; arting joint, 'at least one of said sections having a molding cavity including a bottom wall, said bottom wall having a plurality of bores, each" bore including'a wide end and a narrow end, a first tapered wall on said bore tapering inwardly toward the axis of each bore from the wide end to the narrow end; a plurality of supporting members within said bores adapted to supporta plurality oftubes within said moldbore during thefo'rmation or'rn' lds wherebys'aid tubes will be imbedded within said molds'with open end portions projecting therefrom comprising; a plurality of plugs, each having a substantially frusto-conioal jbody including a wide end portion anda'narrower end'pdrtiorgl'a second tapering wall on each plug tapering inwardly from 'the wide end portion toward 'the narrow end Portion, the inward taper of said second Wallheing greater than the inward taper of said firstw'all whereby said narrow end portion of said plug is narrower than said narrow end of said bore, said plugs being adapted to engage said bores in mating relation with said wide end portion of said plug sealing said wide end of said bore, said plugs each including a second bore adapted to receive and support open end portions of said tubes.

2. In a mold box assembly including a pair of complemental sections having opposed parting faces providing a parting fjoint, at least one of said sections having a mold cavity including at least one bore, said bore having an inner wide end and an outer narrow end, said bore having a first tapered wall tapering inwardly toward said narrow end; at least; one supporting member-within said bore adapted to support atube within said mold box during the forming of .molds whereby said tube will be embedded within said mold, said supporting member. corn prising a body including a wide end portion'and a narrower end portion, and, a second tapering wall on said supporting member tapering inwardly from the wide end portion toward the narrow end portion, said narrow end portion of said, supporting member being narrower than said narrow end of said bore, said supporting member being adapted to engage said bore in mating relation with said wide end portion of said supporting member sealing said wide end of said bore, said supporting member including a second axially extending bore adapted to receive and support an open end portion of a tube.

3. In a mold box assembly including a pair of complemental sections having opposed parting faces providing aparting joint at least one of said sectionshaving a mold cavity including at least one bore, said bore having an inner wide end and an outer narrow end, said bore having a first tapered'wall tapering inwardly toward said narrow end; at least one supporting member within said bore adapted to support a tube within said mold box during the forming of molds whereby said tube will be embedded within said mold, said supporting member comprising a body including a wide end portion and a narrower end portion, and a second tapering wall tapering on said supporting member inwardly from the wide end portion toward the narrow end portion, said narrow end portion of said supporting member being narrower than said narrow end of said bore, said supporting member being adapted to engage said bore in mating relation with said wide end portion of said supporting member sealing said wide end of said bore, said supporting member including means for Supporting a tube.

4. A mold box assembly having walls forming a. molding cavity, one ofrsaid walls having a tapered bore, supporting means. within said bore adapted to supportan object within said cavity during molding whereby said object is embedded within a mold; comprising a supporting element having a generally cylindrical body, and a cylindrical taperin'gwall on said body, said body having an axially extending bore opening inwardly into said cavity for receiving a portion of an object in mating relation, said cylindrical tapering wall tapering generally in'simi lar manner assaid tapered bore but more acutely, wherefis a enses s aul strangeness with. an

bore, said body is supported within said bore to seal said bore from said cavity, said supporting means being readily removable from said bore with a mold as it is removed from said cavity.

5. A mold box assembly having walls forming a molding cavity, one of said walls having a tapered bore, supporting means within said bore adapted to support an object within said cavity during molding whereby said object is embedded within a mold comprising; a supporting element having a generally cylindrical body, anda cylindrical tapering wall on said body, means on said body for supporting an object within said cavity, said cylindrical tapering wall tapering generally in similar manner as said tapered bore but more acutely, whereby during the mating of said supporting means with said bore, said body is supported within said bore to seal said bore from said cavity, said supporting means being readily removable from said bore with a mold as it is removed from said cavity.

References Cited in the file of this patent UNITED STATES PATENTS 815,181 Krause Mar. 13, 1906 940,302 Casey NOV. 16, 1909 1,365,702 Knadler Jan. 18, 1921 1,404,487 Sloan Jan. 24, 1922 FOREIGN PATENTS 103,388 Great Britain Jan. 25, 1917 

